Backstory and Context
The idea for the arch originated from wealthy businessman, lawyer, road builder, and philanthropist Sam Hill, who was the director of the Pacific Highway Association at the time. Hill was a well-known figure in the Pacific Northwest, having built the mansion that is now called the Maryhill Museum of Art (in Maryhill, WA), promoted the construction of paved roads, and built a replica of Stonehenge (also in Maryhill). Hill was also a strong advocate for peace and admired the fact that the U.S. and Canada existed peacefully for so long despite having a long, unprotected border.
Hill paid for much of the arch using his own money. It was probably designed by architect Harvey Wiley Corbett, who was based in New York and a promoter of skyscrapers. The arch was built using 800 yards of concrete and fifty tons of steel. Half of it stands in the U.S. and the other in Canada. The park is divided into two: the Peach Arch Provincial Park (British Columbia) and the Peach Arch Historical State Park (Washington).
"Association Profile." International Peach Arch Association. Accessed February 4, 2020. http://www.peacearchpark.org/about-us.
"Peace Arch Historical State Park." Washington State Parks. Accessed February 4, 2020. https://parks.state.wa.us/562/Peace-Arch.
Wang, Steve. "Peace Arch." December 13, 1996. https://npgallery.nps.gov/GetAsset/26b83e42-db37-4aa6-b99f-5b33bf12bf76
Wikimedia Commons: https://commons.wikimedia.org/wiki/File:Peacearch-usside.jpg